Export csv file to open with Excel

Hi. I have this code, it works.

$arch = fopen('sales.csv', 'w+');
fputs($arch, "Code, Name, Amount".PHP_EOL);
$sql = "SELECT code, name, amount from table";
$sth = $BD->query($sql);
$sth->execute();
if ($sth->rowCount() > 0) {
    while ($fila = $sth->fetch(PDO::FETCH_ASSOC)){
        fputs($arch, implode($fila, ',').PHP_EOL);
        }
    }
fclose($arch);

PHP:

The csv file show this records. There are ok.

Code, Name, Amount
178,CAÑAVERAL,45.00
677,DIVINO NIÑO,30.00
679,HUACHO,15.00
2291,D' VANIA,120.00
2297,SEÑOR DEL MAR,150.00

Code (markup):

When the csv file is opened with Excel (users using Excel), show this:

Código     Nombre     Importe
178    CAÑAVERAL    45
677    DIVINO NIÑO    30
679    HUACHO    15
2291    D' VANIA    120
2297    SEÑOR DEL MAR    150

Code (markup):

How I do to show the corrects characters?
Thanks.

 

The Windows operating system (Windows 7+) has a setting for the 'list separator'.
In Windows 10:
To change
Settings -> Time & Language
-> Additional date, time & regional setting (at the bottom of the screen)
-> change date, time or number formats
-> Additional settings ... (Button)

The List Separator field is the field that sets this.

 

Is it just me or did the language just change while importing?